“The sex of a newborn individual in some species is largely determined genetically, while in others it is otherwise” Give three different examples to justify this statement.

“The sex of a newborn individual in some species is largely determined genetically, while in others it is otherwise” Examples to justify this statement is as follows:

i. Snails can change their sex when required. Hence sex is not determined genetically.

ii. For birds, reptiles and lizards; the sex of the child depends upon the incubation temperature, i.e., sex determination depends on environmental factors

iii. In some reptiles, the sex determination is temperature dependent, i.e., the temperature at which the fertilised egg is incubated before hatching, plays a role in sex determination of the offspring, e.g.: turtles and lizard.

iv. In some marine worms, the sex is determined by the physical contact between the larvae and female. If they mate with the female, they will become a male whereas if they do not mate, they will grow into females.